exec() Page never loads

[tsclan]

I have this current small code which will execute a .sh file depending what button was pressed:

PHP Code:

<?PHP 
if(isset($_POST['restartbot'])) {
    echo 'Bot restarted';
    chdir('/home/rtcw/wab-1.0a');
    exec("./wab-restartwab.sh", $output); 
    echo $output;
    exit();
} 
if(isset($_POST['restartserver'])) {
    echo 'Server Restarted';
    chdir('/home/rtcw/wab-1.0a');
    shell_exec("./wab-restartwolf.sh"); 
}

?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method = "post">
<input type="Submit" name="restartbot" value="Restart Bot"><br />
<input type="Submit" name="restartserver" value="Restart Server">
</form>

Now this does work and it does restart the server and bot when i press the button, so the files are being executed. Although when I press the button the page just loads and never actaully displays any of the text I want it to echo. Instead the loading bar on IE just slowly crawls along even though the command has been exacuted it still doesnt load the page.
In Firefox when I click on a button it does display the text in the echo but the loading bar stops halfway and says "Transfering Data From xxx.xxx.xxx.xxx:"

I have no idea whats causing the page not to load even though the exec has been done. So any help or ideas on this would be great
Thanks

[Velox Letum]

Its probably executing the script before the server can make a connection and send the page to you. You might implement a delay?

[tsclan]

Ok so where exactly do I put the delay?
I Take ill be using the sleep function for delaying it
e.g "sleep(10);"
But would that be before or after the exec ?

But thanks for your Idea